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Why won’t the dishwasher clean? Did you load the dishes, run a wash cycle that ended successfully, but when you opened the door, you found the dishes dirty or not washed at all? Perhaps the dishwasher does not take out detergent or draws water, but does not clean the appliances. How to find and fix the problem, read the article.
Causes and symptoms of PMM malfunction
First you need to understand exactly how the machine performs the cycle. Each sign can indicate a separate breakdown. Please note that your dishwasher:
- She took water, but did not wash the dishes. At the exit, the plates are dirty and untouched by water.
- She stopped washing cutlery, because at the end of the cycle the dishes are wet, but dirty.
- Washes badly. The technique worked on the installed program, but the result is poorly washed utensils.
Why did PMM start to work badly? The reasons can be varied, here are some of them:
- errors during operation;
- problems with water supply;
- water does not circulate in the system at the proper level;
- no detergent intake;
- sprinkler malfunction (upper or lower).
Only a thorough inspection will help determine where the breakdown occurred. Let’s consider everything in order.
Incorrect operation of the dishwasher
Each dishwasher (Ariston, Bosch, Kuppersberg) comes with instructions. The manufacturer really expects that you will read it, because most problems arise when the elementary rules for using the PMM are not followed.
- Dried food residues on dishes. No matter how good the technique is, it is recommended to completely clean the dishes from pieces of food. Otherwise, the washing result will not be perfect.
- Wrong program. You want to save resources, so you install short programs. They are designed for lightly soiled devices. Grease and stubborn dirt must be removed at high temperatures.
- Wrong choice of detergent. Your powder may not be dishwasher safe. Try changing the medium.
The arrangement of dishes in the baskets also matters. Here are the mistakes users make:
- Put large dishes and plates in the upper section, and small cups and glasses in the lower. This blocks the access of water to the devices.
- Place objects in the pan, near the sprinkler, which may block its operation.
- Place the plates so that they cover the detergent compartment.
It is important to properly care for your dishwasher. The drain must be cleaned 1-2 times a month, and chemical cleaning cycles should be run every six months.
The reason that the equipment fills with water and does not work may be scale. It is not noticeable from the outside, but inside it settles on metal parts. It can clog the nozzles in the rocker arm, blocking the water outlet. Therefore it is important to use special salt. It reduces the level of water hardness, and hence the amount of harmful impurities.
We fix problems in the PMM with our own hands
There are also more serious problems that need to be fixed.
No water intake
Why is the system heating the water but not washing the dishes? The control board “thinks” that there is water in the tank, because it receives such data from the pressure switch. As a result, the heating element is turned on for heating, but without water it overheats and burns out. So, you need to check the level sensor.
Watch your dishwasher work. If you see that the technique is working, but do not hear the characteristic murmur when water is drawn in, then you need to check the inlet valve.
What to do:
- stop the program;
- check shut-off valve;
- check the valve.
Usually it is located below the front panel. But different manufacturers can place the valve on the side and back.
We will describe the general sequence of works:
- turn off the water supply;
- remove the bottom panel under the door;
- disconnect the inlet hose;
- behind it is a valve;
- check the electronic part of the part with a multimeter, connect the probes to the contacts and see the value;
- if the valve is working, it will show from 500 to 1500 ohms;
- check the mechanical part by applying voltage to 220 V; if at the same time the membrane opens, the part is working;
- to replace, disconnect the hose and wiring from the valve;
- set a new element.
Also check the inlet hose and strainer. Cleaning is carried out under pressure from a tap.
Water does not circulate well, detergent problems
If there is a normal water intake, but the equipment does not start washing or does not wash off the dirt from the dishes, then the circulation system in the PMM is broken. Check:
- Nozzles. Open the bunker, pull out the baskets. Remove the lower and upper spray arms. Clean the nozzles with a toothpick and rinse under the tap.
- Circulation pump. The machine fills with water, but then stops. To diagnose, you will have to disassemble the dishwasher.
Important! The circulation unit (or engine) is an expensive part. Sometimes it is better to entrust the work to the master.
What do we have to do:
- disconnect the PMM from the network and communications;
- put in a free place and lay an old blanket (towel);
- flip the case onto the back panel;
- remove the bottom panel under the door;
- unscrew the screws around the perimeter and remove the pan (preliminarily disconnect the float sensor, which is located on the pan);
- in the center you will find a circulation block;
- inspect the pump, ring the electronic part with a multimeter;
- in the event of a malfunction, the element will have to be completely replaced.
If you are convinced that the water washes the dishes normally, but there are stains and food residues on the surface, check the detergent dispenser. Unscrupulous manufacturers make a cuvette from cheap material.
When exposed to hot steam, the plastic expands. Therefore, the compartment is jammed. The tablet does not dissolve properly. The way out is to replace the cuvette or adjust the compartment with your own hands.
Heating problems
Depending on the PMM device, a breakdown can manifest itself in different ways. More modern models have a built-in temperature sensor that controls the heating temperature. If you set the program to 70 degrees, then when the temperature is reached, the sensor sends a signal to the module, which turns off the heating element.
If the heater burns out, then the machine (Bosch, Siemens, Ariston and others) takes on water, starts heating and stops. Models without a sensor continue to work with cold water, so the devices are difficult to clean.
How to understand that washing takes place in cold water? Open the door after the end of the cycle. Walls and dishes should be warm. You can also feel the nozzle during the first drain.
Usually, a flow heater is installed in the machines, so in the event of a breakdown, you will have to change the entire unit. The sequence of work is the same as when replacing the pump. Only first you need to unscrew the fixing screws inside the camera.
When the equipment does not turn on and does not start, the matter may be in the control module. This is the most serious damage that you cannot fix on your own. The electronic board controls all processes in the dishwasher. You can check it, but it is better to entrust the repair to a specialist.
We have listed the possible reasons for the decline in the quality of dishwashing. If you notice something like this, proceed to fix the problem. After all, why do you need a car that does not perform its main function?